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From: Garrett Cooper <gcooper@FreeBSD.org>
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Cc:
Subject: bin/148024: Some built-in AT&T/POSIX compat make variables are
broken
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>Number: 148024
>Category: bin
>Synopsis: Some built-in AT&T/POSIX compat make variables are broken
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jun 21 00:50:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Garrett Cooper
>Release: 9-CURRENT
>Organization:
Cisco Systems, Inc.
>Environment:
FreeBSD bayonetta.local 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r206173M: Mon Apr 26 22:45:06 PDT 2010 root@bayonetta.local:/usr/obj/usr/src/sys/BAYONETTA.ata amd64
>Description:
I'm trying to convert some GNU makefiles over to a POSIX compliant form, and it appears that our copy of make is broken in that respect.
Example:
$ cat ~/Makefile.prereq
bar:
foo: bar
@echo target: $@ prereq: $<
$ make -f ~/Makefile.prereq foo
target: foo prereq:
The above invocation should have printed out:
target: foo prereq: bar
Furthermore, even though FreeBSD's version of pmake claims to drop this support as per the manpage for backwards compatibility with AT&T...
.ALLSRC The list of all sources for this target; also known as `>'.
.ARCHIVE The name of the archive file; also known as `!'.
.IMPSRC The name/path of the source from which the target is to be
transformed (the ``implied'' source); also known as `<'.
.MEMBER The name of the archive member; also known as `%'.
.OODATE The list of sources for this target that were deemed out-of-
date; also known as `?'.
.PREFIX The file prefix of the file, containing only the file portion,
no suffix or preceding directory components; also known as `*'.
.TARGET The name of the target; also known as `@'.
and POSIX specifies that these variables should exist, they don't function in our version of make:
The five internal macros are:
$@
The $@ shall evaluate to the full target name of the current target, or the archive filename part of a library archive target. It shall be evaluated for both target and inference rules.
For example, in the .c.a inference rule, $@ represents the out-of-date .a file to be built. Similarly, in a makefile target rule to build lib.a from file.c, $@ represents the out-of-date lib.a.
$%
The $% macro shall be evaluated only when the current target is an archive library member of the form libname( member .o). In these cases, $@ shall evaluate to libname and $% shall evaluate to member .o. The $% macro shall be evaluated for both target and inference rules.
For example, in a makefile target rule to build lib.a( file.o), $% represents file.o, as opposed to $@, which represents lib.a.
$?
The $? macro shall evaluate to the list of prerequisites that are newer than the current target. It shall be evaluated for both target and inference rules.
For example, in a makefile target rule to build prog from file1.o, file2.o, and file3.o, and where prog is not out-of-date with respect to file1.o, but is out-of-date with respect to file2.o and file3.o, $? represents file2.o and file3.o.
$<
In an inference rule, the $< macro shall evaluate to the filename whose existence allowed the inference rule to be chosen for the target. In the .DEFAULT rule, the $< macro shall evaluate to the current target name. The meaning of the $< macro shall be otherwise unspecified.
For example, in the .c.a inference rule, $< represents the prerequisite .c file.
$*
The $* macro shall evaluate to the current target name with its suffix deleted. It shall be evaluated at least for inference rules.
For example, in the .c.a inference rule, $*.o represents the out-of-date .o file that corresponds to the prerequisite .c file
See http://www.opengroup.org/onlinepubs/009695399/utilities/make.html for more details.
>How-To-Repeat:
See above testcase.
>Fix:
Looking at fixing this.
>Release-Note:
>Audit-Trail:
>Unformatted: